HD 221148

HD 221148
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquarius
Right ascension	23h 29m 32.08207s
Declination	−04° 31′ 57.8915″
Apparent magnitude (V)	6.26
Characteristics
Spectral type	K3IIIv
U−B color index	+1.20
B−V color index	+1.10
Astrometry
Radial velocity (Rv)	−26.53±1.94 km/s
Proper motion (μ)	RA: +181.03 mas/yr ; Dec.: −232.23 mas/yr
Parallax (π)	21.14 ± 0.56 mas
Distance	154 ± 4 ly ; (47 ± 1 pc)
Details
Radius	5 R☉
Luminosity	8.9 L☉
Surface gravity (log g)	3.1 cgs
Temperature	4,592 K
Metallicity [Fe/H]	+0.11 dex
Rotational velocity (v sin i)	2.2 km/s
Other designations
	BD-05° 5999, FK5 3881, HD 221148, HIP 115953, HR 8924, LTT 9560, SAO 146736.
Database references
SIMBAD	data

HD 221148 is suspected variable star in the equatorial constellation of Aquarius. The spectrum of the star shows exceptionally strong levels of CN; one of the highest cyanogen indices measured.^[4]

References

^ ^a ^b ^c ^d ^e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
^ ^a ^b ^c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
^ ^a ^b ^c ^d ^e ^f ^g ^h Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209
^ Janes, K. A. (May 1975), "Cyanogen Strengths, Luminosities, and Kinematics of K Giant Stars", Astrophysical Journal Supplement, 29: 161–183, Bibcode:1975ApJS...29..161J, doi:10.1086/190339. See p. 179.{{citation}}: CS1 maint: postscript (link)